Reliability test system and test method for liquid hydrogen temperature zone valves with reduced consumption and increased efficiency

Abstract

The present application relates to the technical field of valve performance testing, and in particular to a liquid hydrogen temperature zone valve reliability testing system and testing method for reducing consumption and increasing efficiency, wherein the testing system comprises a liquid nitrogen cryogenic tank and a liquid helium cooling chamber; the liquid nitrogen cryogenic tank is selectively connected to a liquid nitrogen storage device through a liquid guide tube; the liquid helium cooling chamber is located in the liquid nitrogen cryogenic tank and selectively connected to a liquid helium storage device; the test main path introduces helium into the valve to be tested and determines the sealing condition of the valve to be tested; the heat transfer coil is located in the liquid helium cooling chamber and is wound around the valve pipe, one end of the heat transfer coil passes through the liquid helium cooling chamber and selectively connects to the liquid guide tube, and the other end of the heat transfer coil passes through the liquid helium cooling chamber and connects to the liquid nitrogen cryogenic tank. Directly introducing liquid nitrogen into the contact point of the valve pipe enhances the heat conduction effect, thereby more effectively reducing the temperature of the valve to be tested, and more efficient use of liquid helium can be achieved, reducing the test cost.

Description

Technical Field

[0001] The present application relates to the technical field of valve performance testing, and in particular to a liquid hydrogen temperature zone valve reliability testing system and testing method for reducing consumption and increasing efficiency. Background Art

[0002] Low-temperature liquid hydrogen storage and transportation has the advantages of high storage traffic density and low long-distance transportation cost, and is an ideal hydrogen energy storage and transportation mode. Liquid hydrogen storage tanks, liquid hydrogen tank trucks, liquid hydrogen cylinders, liquid hydrogen pipelines, etc. are all common liquid hydrogen storage and transportation equipment. Among them, various forms of valves such as stop valves, check valves, and emergency shut-off valves are important components of liquid hydrogen storage and transportation equipment, and play a key role in the medium sealing and start-stop efficiency of liquid hydrogen containers and pipelines. During their service, the above-mentioned valves are in contact with liquid hydrogen or low-temperature hydrogen most of the time, and the working environment is extremely harsh. The most common failure mode is leakage caused by excessive deformation of the metal seals at the valve fitting at extremely low temperatures. Once liquid hydrogen leaks, it will gasify in a very short time to generate a large amount of hydrogen, which is prone to combustion or even explosion. Therefore, the low-temperature sealing performance of liquid hydrogen valves is its key performance, and it is necessary to test and verify the sealing performance of liquid hydrogen valves in a real medium environment.

[0003] In order to avoid frost, the valve is set to an extended valve body. An existing liquid hydrogen valve sealing performance test device includes a hydrogen supply subsystem, a hydrogen cooling and liquefaction subsystem, and a valve sealing performance detection subsystem. The internal cooling method is used to perform internal leakage detection and external leakage detection on the valve under test in a liquid hydrogen environment. By combining liquid nitrogen primary cooling with liquid helium secondary cooling, high-pressure hydrogen is cooled and liquefied at the test site, and liquid hydrogen medium can be obtained continuously and in large quantities, thereby realizing low-temperature sealing performance testing of the valve under test in a real liquid hydrogen medium environment; the valve under test is insulated using a vacuum test chamber to prevent boiling of liquid hydrogen due to heat leakage when flowing through the valve under test. However, liquid hydrogen mainly flows in the main channel of the valve under test, that is, it enters from the air inlet of the valve under test and flows out from the air outlet of the valve under test, resulting in a large difference between the temperature of the extended part of the valve under test and the temperature of the main channel, which cannot fully simulate the actual working conditions of the cryogenic valve and is difficult to meet the complex testing requirements of the liquid hydrogen valve. Summary of the invention

[0004] In order to fully and realistically simulate the actual working conditions of cryogenic valves and meet the complex testing requirements of liquid hydrogen valves, the present application provides a liquid hydrogen temperature zone valve reliability testing system and testing method that reduces consumption and increases efficiency.

[0005] The present application provides a liquid hydrogen temperature zone valve reliability testing system and testing method for reducing consumption and increasing efficiency, which adopts the following technical solutions: In the first aspect, a liquid hydrogen temperature zone valve reliability test system for reducing consumption and increasing efficiency comprises: A cryogenic container, comprising a liquid nitrogen cryogenic tank and a liquid helium cooling chamber; the liquid nitrogen cryogenic tank is selectively connected to a liquid nitrogen storage device through a liquid guide tube; the liquid helium cooling chamber has a closed chamber, is located in the liquid nitrogen cryogenic tank, is selectively connected to the liquid helium storage device through a liquid inlet pipe, and is used to accommodate a valve body of a valve to be tested, and the valve to be tested is provided with an air inlet, an air outlet and a valve pipe; The test main circuit includes an air inlet branch and an air outlet branch; the air inlet branch is used to communicate with the air inlet of the valve to be tested to introduce helium into the valve to be tested; the air outlet branch is used to communicate with the air outlet of the valve to be tested to determine the sealing condition of the valve to be tested; The heat transfer coil is located in the liquid helium cooling chamber and is used to be wound around the valve pipe. One end passes through the liquid helium cooling chamber and can be selectively connected to the liquid guide pipe, and the other end passes through the liquid helium cooling chamber and is connected to the liquid nitrogen low temperature tank.

[0006] By adopting the above technical scheme, the liquid helium cooling chamber is located in the liquid nitrogen cryogenic tank, and the liquid nitrogen in the liquid nitrogen cryogenic tank can initially cool down the valve to be tested in the liquid helium cooling chamber, and the liquid helium in the liquid helium cooling chamber can further cool down the valve to be tested. Compared with directly using liquid helium for cooling, this scheme can reduce the consumption of liquid helium and reduce the test cost. The liquid helium cooling chamber is arranged in the liquid nitrogen cryogenic tank. On the one hand, it provides a dual cold preservation effect for the valve to be tested. On the other hand, during the test, the liquid helium cooling chamber is placed in the low-temperature liquid nitrogen tank for cooling and cold preservation, which can reduce the thermal influence of the inner wall temperature of the liquid helium cooling chamber on the liquid helium, further realize more efficient use of liquid helium, further reduce the consumption of liquid helium, and reduce the test cost. By directly introducing liquid nitrogen to the contact point of the valve pipe, the heat conduction effect is enhanced, thereby more effectively reducing the temperature of the valve to be tested to meet the strict requirements of valve testing in the liquid hydrogen temperature zone.

[0007] Optionally, also include: a first connecting pipeline, one end of which is connected to one end of the gas outlet branch close to the liquid helium cooling chamber, and the other end of which is connected to the liquid guide pipe, and a stop valve is provided on the first connecting pipeline; A second connecting pipeline has one end connected to one end of the air inlet branch close to the liquid helium cooling chamber and the other end connected to the liquid nitrogen cryogenic tank. A stop valve is provided on the second connecting pipeline.

[0008] By adopting the above technical solution, the first connecting pipe connects the gas outlet branch with the liquid guide tube, and the second connecting pipe directly connects the gas inlet branch with the liquid nitrogen low-temperature tank, so that the liquid nitrogen can directly flow into the valve to be tested for cooling, which not only improves the cooling efficiency and shortens the time for the valve to be tested to reach the test temperature, but also enhances the flexibility and control accuracy of the system, so that the gas flow can be quickly adjusted in different test stages to ensure the safety and reliability of the test process.

[0009] Optionally, the gas outlet branch includes an outlet pipe, an alcohol bubble counter and an exhaust pipe, one end of the outlet pipe extends into the bottom of the alcohol bubble counter, and the other end passes through the liquid helium cooling chamber to be connected to the gas outlet of the valve to be tested, and one end of the exhaust pipe extends into the top of the alcohol bubble counter, and the other end is used for exhaust.

[0010] By adopting the above technical solution, the sealing degree of the valve to be tested can be judged by the number of bubbles in the alcohol bubble counter.

[0011] Optionally, a flow meter is provided on the exhaust pipe.

[0012] By adopting the above technical solution and measuring the flow rate of the air outlet pipe, the sealing performance of the valve to be tested can be determined more accurately.

[0013] Optionally, the wall of the liquid helium cooling chamber is a double-layer structure and is provided with an interface for communicating with a vacuum pumping device.

[0014] By adopting the above technical solution and using a vacuum device to discharge the air and other gases in the double-layer structure, the heat conduction and convection of the gas molecules can be reduced, the heat load of the liquid helium cooling chamber can be reduced, the insulation effect can be improved, the vaporization loss of liquid helium can be reduced, and the test cost can be reduced.

[0015] Optionally, the tank wall of the liquid nitrogen low-temperature tank is a double-layer structure, and an insulating layer is provided between the inner and outer layers.

[0016] By adopting the above technical solution, the insulation effect is improved, the vaporization loss of liquid helium is reduced, and the test cost is reduced.

[0017] Optionally, it further includes a temperature measuring component, which includes a second temperature sensor, and the second temperature sensor is used to be arranged on the valve to be measured.

[0018] By adopting the above technical solutions, the test environment can be precisely controlled and monitored, the accuracy and reliability of the test can be improved, and the performance test results of the valve in the liquid hydrogen temperature range can be ensured to be true and valid.

[0019] Optionally, the air intake branch includes a first helium storage device and a booster pump connected in sequence through an air intake pipe, and an end of the air intake branch away from the first helium storage device passes through the liquid helium cooling chamber to be connected to the air intake port of the valve to be tested.

[0020] By adopting the above technical solution, a booster pump is used to continuously introduce helium into the valve to be tested, and the sealing condition of the valve to be tested is determined through the gas outlet branch.

[0021] Optionally, the liquid helium storage device includes a second helium storage device and a liquid helium tank, the second helium storage device is connected to the top of the liquid helium tank, one end of the liquid inlet pipe extends into the bottom of the liquid helium tank, and the other end is connected to the top of the liquid helium cooling chamber.

[0022] By adopting the above technical solution, liquid helium can be introduced into the liquid helium cooling chamber.

[0023] Optionally, it further includes a first discharge pipe, the gas outlet branch is connected to the first discharge pipe, and a purge valve is provided on the first discharge pipe.

[0024] By adopting the above technical solution, on the one hand, it helps to prevent excessive pressure or potential explosion risks caused by gas accumulation, and on the other hand, it can remove residual gas in the pipeline, ensure the cleanliness of the inside of the pipeline, and avoid gas leakage or cross contamination.

[0025] Optionally, a second discharge pipe is further included, wherein the second discharge pipe is connected to the top of the liquid helium cooling chamber, and the second discharge pipe is connected to a discharge valve and / or a safety valve.

[0026] By adopting the above technical solution, the discharge valve can be used for normal discharge of liquid helium after vaporization during the cooling process, and the safety valve can release excess pressure to prevent equipment damage or safety accidents caused by pressure accumulation.

[0027] In a second aspect, a method for testing the reliability of a valve in a liquid hydrogen temperature zone with reduced consumption and increased efficiency is provided, based on the above-mentioned system for testing the reliability of a valve in a liquid hydrogen temperature zone with reduced consumption and increased efficiency, and comprises the following steps: Install the valve to be tested in a liquid helium cooling chamber and connect it to the test main circuit; Introduce liquid nitrogen into the liquid nitrogen low temperature tank and the heat transfer coil to cool down the valve to be tested; Introduce liquid helium into the liquid helium cooling chamber to further cool the valve to be tested; After cooling down, the main test line is turned on, the valve to be tested is closed, helium is introduced into the valve to be tested through the air inlet branch, and the sealing condition of the valve to be tested is determined through the air outlet branch.

[0028] In summary, the present application includes at least one of the following beneficial technical effects: 1. The liquid helium cooling chamber is located in the liquid nitrogen cryogenic tank. The liquid nitrogen in the liquid nitrogen cryogenic tank can initially cool down the valve to be tested in the liquid helium cooling chamber, and the liquid helium in the liquid helium cooling chamber can further cool down the valve to be tested. Compared with directly using liquid helium for cooling, this solution can reduce the consumption of liquid helium and reduce the test cost.

[0029] 2. The liquid helium cooling chamber is set in the liquid nitrogen low temperature tank. On the one hand, it provides dual cooling for the valve to be tested. On the other hand, during the test, the liquid helium cooling chamber is placed in the low temperature liquid nitrogen tank for cooling and cooling, which can reduce the thermal influence of the inner wall temperature of the liquid helium cooling chamber on the liquid helium, further realize more efficient use of liquid helium, further reduce the consumption of liquid helium, and reduce the test cost.

[0030] 3. The wall of the helium cooling chamber is a double-layer structure and is provided with an interface for connecting with a vacuum pumping device; the wall of the liquid nitrogen cryogenic tank is a double-layer structure and is in a vacuum state. The use of a vacuum pumping device to discharge air and other gases in the double-layer structure can reduce the heat conduction and convection of gas molecules, reduce the heat load of the liquid helium cooling chamber, improve the insulation effect, reduce the vaporization loss of liquid helium, and reduce the test cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the liquid hydrogen temperature zone valve reliability test system for reducing consumption and increasing efficiency in this application; Figure 2 yes Figure 1 A partial connection diagram of the liquid nitrogen cryogenic tank, the liquid helium cooling chamber, the liquid nitrogen storage device and the liquid helium storage device; Figure 3 yes Figure 1 Schematic diagram of partial connection of liquid nitrogen cryogenic tank, liquid helium cooling chamber, air inlet branch and air outlet branch; Figure 4 yes Figure 1 Schematic diagram of the partial connections of the liquid nitrogen cryogenic tank, liquid helium cooling chamber, and heat transfer coil.

[0032] Description of reference numerals: 100, valve to be tested; 101, air inlet; 102, air outlet; 103, valve pipe 103; 1, liquid nitrogen cryogenic tank; 110, liquid guide tube; 2, liquid helium cooling chamber; 210, liquid inlet pipe; 3, liquid nitrogen storage device; 4, liquid helium storage device; 41, second helium storage device; 42, liquid helium tank; 5, air inlet branch; 51, air inlet pipe; 52, first helium storage device; 53, booster pump; 6, air outlet branch; 61, air outlet pipe; 62, alcohol bubble counter; 63, exhaust pipe; 64, flow meter; 7, second connecting pipe channel; 8, first discharge pipe; 9, second discharge pipe; 10, heat transfer coil; 11, first connecting pipeline; V1, helium pressure regulating valve; V2, upstream isolation valve; V3, purge valve; V4, downstream isolation valve; V5, discharge valve; V6, safety valve; V7, liquid helium regulating valve; V8, helium regulating valve; V9, liquid nitrogen inlet valve; TC1, first temperature sensor; TC2, second temperature sensor; TC3, third temperature sensor; TC4, fourth temperature sensor; TC5, fifth temperature sensor; TC6, sixth temperature sensor. DETAILED DESCRIPTION

[0033] The following will be combined with the attached Figure 1-4 , the technical solutions in the embodiments of the present application are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] The embodiment of the present application discloses a liquid hydrogen temperature zone valve reliability testing system for reducing consumption and increasing efficiency, which is used to test the liquid hydrogen temperature zone performance of the valve. Applicable liquid hydrogen valve types include but are not limited to stop valves, regulating valves, check valves, emergency shut-off valves, ball valves, and butterfly valves; liquid hydrogen valve tests that can be performed include but are not limited to normal temperature sealing tests, low temperature and low pressure sealing tests, low temperature and high pressure opening and closing tests, low temperature and high pressure sealing tests, and low temperature fugitive emission tests.

[0036] Reference Figure 1 The liquid hydrogen temperature zone valve reliability test system for reducing consumption and increasing efficiency includes a low-temperature container, a test main circuit, a heat transfer coil 10 and a temperature measurement component.

[0037] Reference Figure 2 The cryogenic container includes a liquid nitrogen cryogenic tank 1 and a liquid helium cooling chamber 2. The liquid nitrogen cryogenic tank 1 is selectively connected to the liquid nitrogen storage device 3 through a liquid conduit 110. In this embodiment, the liquid nitrogen storage device 3 is a liquid nitrogen storage tank, and a liquid nitrogen inlet valve V9 is provided on the liquid conduit 110. When the liquid nitrogen inlet valve V9 is opened, the liquid nitrogen storage device 3 introduces liquid nitrogen into the liquid nitrogen cryogenic tank 1.

[0038] The liquid helium cooling chamber 2 has a closed chamber, and can be selectively connected to the liquid helium storage device 4 through the liquid inlet pipe 210. The liquid inlet pipe 210 is provided with a liquid helium regulating valve V7. When the liquid helium regulating valve V7 is opened, the liquid helium storage device 4 introduces liquid helium into the liquid helium cooling chamber 2. The liquid helium cooling chamber 2 is used to accommodate the valve 100 to be tested, and is located in the liquid nitrogen cryogenic tank 1. In this embodiment, the valve 100 to be tested is provided with an air inlet 101, an air outlet 102 and a valve pipe 103.

[0039] Specifically, the liquid helium storage device 4 includes a second helium storage device 41 and a liquid helium tank 42. The second helium storage device 41 is connected to the top of the liquid helium tank 42. A helium regulating valve V8 is connected between the second helium storage device 41 and the liquid helium tank 42. One end of the liquid inlet pipe 210 extends into the bottom of the liquid helium tank 42, and the other end is connected to the top of the liquid helium cooling chamber 2. The liquid helium tank 42 is a mobile liquid helium tank, and the second helium storage device 41 is a helium cylinder. The pressure of the liquid helium tank 42 is lower than the pressure of the helium cylinder. The pressure difference is conducive to the transportation of liquid helium from the liquid helium tank 42 to the liquid helium cooling chamber 2. A pressure sensor is provided on the second helium cylinder to measure the outlet pressure of the second helium cylinder.

[0040] The valve body of the valve to be tested 100 is located in the liquid helium cooling chamber 2, and the liquid helium cooling chamber 2 is located in the liquid nitrogen cryogenic tank 1. The liquid nitrogen in the liquid nitrogen cryogenic tank 1 can initially cool the valve to be tested 100 in the liquid helium cooling chamber 2. The liquid helium in the liquid helium cooling chamber 2 can further cool the valve to be tested 100. Compared with directly using liquid helium for cooling, this solution can reduce the consumption of liquid helium and reduce the test cost.

[0041] In this embodiment, the wall of the liquid helium cooling chamber 2 is a double-layer structure, and is provided with an interface C4 for communicating with a vacuum pumping device. Specifically, a liquid helium inlet vacuum insulation pipeline is provided on the liquid helium cooling chamber 2, and an interface C4 is provided on the vacuum insulation pipeline. The air and other gases in the double-layer structure can be discharged through the vacuum pumping device. After vacuuming, the interface C4 is sealed with a plug to form a highly vacuum environment, thereby greatly reducing the heat conduction and convection of gas molecules and improving the insulation effect.

[0042] The tank wall of the liquid nitrogen cryogenic tank 1 is also a double-layer structure, and the outer two layers are an insulating layer. In this embodiment, the inner and outer walls of the liquid nitrogen cryogenic tank 1 are filled with high thermal insulation polymer foam material and aluminum silicate insulation cotton to form an intermediate "insulating layer". In other embodiments, the inner and outer layers of the tank wall of the liquid nitrogen cryogenic tank 1 are in a vacuum state to form a vacuum insulation layer.

[0043] The inner and outer layers of the tank wall of the liquid nitrogen cryogenic tank 1 are insulated, which can effectively reduce the external heat from entering the liquid helium cooling chamber 2 through conduction, and help maintain the low temperature state of the liquid helium cooling chamber 2, thereby reducing the vaporization loss of liquid helium, reducing the amount of liquid helium, reducing the test cost, improving the cooling efficiency and maintaining the stability of the low temperature environment. The double cold preservation structure can reduce the overall heat leakage of the valve 100 to be tested, improve the utilization rate of liquid helium, and reduce the consumption of liquid helium.

[0044] The liquid helium cooling chamber 2 is made of wound flame-retardant low-temperature insulation aluminum foil composite material and is made using a multi-layer insulation coating process. This vacuum insulation layer is integrated with the liquid helium inlet vacuum insulation pipeline. The entire outer layer is also a fully sealed structure. After the helium test is qualified, it is vacuumed at the interface C4. The vacuum degree of the entire outer layer at the liquid nitrogen temperature should not be greater than 5×10-3 Pa.

[0045] The liquid helium cooling chamber 2 is arranged in the liquid nitrogen low temperature tank 1. On the one hand, it provides a dual cold preservation effect for the valve 100 to be tested, and on the other hand, it further realizes a more efficient use of liquid helium, further reduces the consumption of liquid helium, and reduces the test cost. The specific principle is as follows: the test structure is subjected to heat transfer analysis, the innermost volume cavity is the liquid helium cooling source, and the liquid helium evaporation rate is determined by the volume temperature of the liquid helium cooling chamber 2, that is, the two surface temperatures of the volume cavity are formed, namely, the outer surface temperature of the valve body and the inner wall temperature of the liquid helium cooling chamber 2. In order to reduce the thermal influence of the inner wall temperature of the liquid helium cooling chamber 2 on the liquid helium, the liquid helium cooling chamber 2 is placed in a low temperature liquid nitrogen tank at -196°C for cooling and cold preservation during the test. In order to further reduce the consumption of liquid helium, it is necessary to control the outer surface temperature of the valve body. The outer surface temperature of the valve body is, from top to bottom, a temperature gradient formed by heat conduction between the ambient temperature and the liquid helium temperature, and the temperature at each location can be measured by the temperature sensor described below.

[0046] Reference Figure 3 The test main circuit includes an air inlet branch 5 and an air outlet branch 6. The air inlet branch 5 is used to communicate with the air inlet 101 of the valve 100 to be tested, and introduce helium into the valve 100 to be tested; the air outlet branch 6 is used to communicate with the air outlet 102 of the valve 100 to be tested, and is used to determine the sealing condition of the valve 100 to be tested.

[0047] The air intake branch 5 comprises a first helium storage device 52 and a booster pump 53 which are connected in sequence through an air intake pipe 51. One end of the air intake branch 5 away from the first helium storage device 52 passes through the liquid helium cooling chamber 2 and is used to communicate with the air inlet 101 of the valve to be tested 100. A helium pressure regulating valve V1 is provided on the air intake pipe 51 near the first helium storage device 52, and an upstream isolation valve V2 is provided on the air intake pipe 51 near the liquid helium cooling chamber 2. The first helium storage device 52 is a first helium cylinder, and a pressure sensor is provided on the first helium cylinder to measure the outlet pressure of the first helium cylinder.

[0048] Two pressure sensors are provided on the air intake pipe 51, which are located on both sides of the booster pump 53, respectively, for measuring the pressure in the air intake pipe 51. The first pressure sensor is located before the booster pump 53, for detecting the pressure of the original gas, while the second pressure sensor is located after the booster pump 53, for monitoring the pressure after boosting. The pressure change of the gas before and after boosting can be monitored in real time, which is helpful to ensure the stability of the gas pressure and predict potential pressure problems. The pressure difference before and after boosting is compared, so as to adjust the working state of the booster pump 53 and ensure that the gas pressure meets the test requirements.

[0049] At least part of the air inlet pipe 51 is a serpentine pipe. In this embodiment, part of the air inlet pipe 51 located in the liquid nitrogen cryogenic tank 1 is a serpentine pipe, which increases the length of the pipe. Since the helium in the first helium storage device 52 is at room temperature and the valve 100 to be tested is at low temperature, the helium flows in the air inlet pipe 51. The air inlet pipe 51 is a serpentine pipe, which can extend the time for the helium to flow in the air inlet pipe 51, promote the heat exchange between the helium and the liquid nitrogen in the liquid nitrogen cryogenic tank 1, and the liquid nitrogen in the liquid nitrogen cryogenic tank 1 can pre-cool the room temperature helium to prevent the room temperature helium from directly entering the valve 100 to be tested and causing the temperature of the valve 100 to be tested to rise.

[0050] The gas outlet branch 6 includes an air outlet pipe 61, an alcohol bubble counter 62 and an exhaust pipe 63. One end of the air outlet pipe 61 extends into the bottom of the alcohol bubble counter 62, and the other end passes through the liquid helium cooling chamber 2, and is used to communicate with the gas outlet 102 of the valve 100 to be tested. A downstream isolation valve V4 is provided on the air outlet pipe 61 near the alcohol bubble counter 62, and a pressure sensor may be provided on the air outlet pipe 61. One end of the exhaust pipe 63 extends into the top of the alcohol bubble counter 62, and the other end is used for exhaust. The sealing degree of the valve 100 to be tested can be judged by the number of bubbles in the alcohol bubble counter 62. A flow meter 64 is provided on the exhaust pipe 63 to measure the flow of the air outlet pipe 61, so as to more accurately judge the sealing of the valve 100 to be tested. The flow meter 64 can be used to measure the instantaneous leakage, the cumulative leakage and the average leakage.

[0051] At least part of the outlet pipe 61 is a serpentine pipe. In this embodiment, part of the outlet pipe 61 located in the liquid nitrogen cryogenic tank 1 is a serpentine pipe, which increases the length of the pipe. The cryogenic helium flows out from the valve 100 to be tested. The outlet pipe 61 is a serpentine pipe, which can extend the flow time of the cryogenic helium in the outlet pipe 61, promote the heat exchange between the cryogenic helium and the liquid nitrogen in the liquid nitrogen cryogenic tank 1, and the liquid nitrogen in the liquid nitrogen cryogenic tank 1 can play a role in reheating the cryogenic helium.

[0052] The temperature measurement component includes a first temperature sensor TC1, a second temperature sensor TC2, a third temperature sensor TC3, a fourth temperature sensor TC4, a fifth temperature sensor TC5, and a sixth temperature sensor TC6.

[0053] Reference Figure 1The first temperature sensor TC1 is arranged in the liquid helium cooling chamber 2, and is used to measure the temperature of the liquid helium in the liquid helium cooling chamber 2; the second temperature sensor TC2 is arranged on the valve to be tested 100, and is used to measure the temperature of the valve to be tested 100; the third temperature sensor TC3 is arranged at the bottom of the outer wall of the valve pipe 103, and is used to measure the temperature of the bottom of the valve pipe 103; the fourth temperature sensor TC4 is arranged at the top of the outer wall of the valve pipe 103, and is used to measure the temperature of the top of the valve pipe 103; the fifth temperature sensor TC5 is arranged at the valve cover stuffing box of the valve to be tested 100, and is used to measure the stuffing temperature; the sixth temperature sensor TC6 is arranged in the external environment, and is used to measure the temperature of the external environment.

[0054] Reference Figure 3 The gas outlet pipe 61 is connected to the first discharge pipe 8, and a purge valve V3 is provided on the first discharge pipe 8. The setting of the discharge pipe helps to prevent excessive pressure or potential explosion risks caused by gas accumulation, and on the other hand, it can remove residual gas in the pipeline, ensure the cleanliness of the inside of the pipeline, and avoid gas leakage or cross contamination.

[0055] Reference Figure 2 The top of the liquid helium cooling chamber 2 is connected to the second discharge pipe 9, and the second discharge pipe 9 is connected to the discharge valve V5 and / or the safety valve V6. In this embodiment, the second discharge pipe 9 is connected to the safety valve V6 and the discharge valve V5 in sequence in the direction away from the liquid helium cooling chamber 2.

[0056] When the pressure in the liquid helium cooling chamber 2 is too high, the excess pressure can be released through the safety valve V6 to prevent equipment damage or safety accidents caused by pressure accumulation. The interior of the liquid helium cooling chamber 2 is a completely sealed chamber. Since the latent heat of vaporization of liquid helium is low, it is very easy to vaporize. In order to ensure the safety of the test, the discharge valve V5 can be used for the normal discharge of liquid helium after vaporization during the cooling process, and the safety valve V6 is used as a protection device to automatically discharge gas when the system pressure exceeds the predetermined safety value to ensure the safe operation of the system, improve the reliability of the system, ensure that the pressure can be released in time in extreme cases, avoid potential safety risks, and facilitate daily system maintenance and pressure control.

[0057] Reference Figure 4The heat conducting coil 10 is located in the liquid helium cooling chamber 2 and is used to be wound around the valve pipe 103. One end passes through the liquid helium cooling chamber 2 and is selectively connected to the liquid guide tube 110, and the other end passes through the liquid helium cooling chamber 2 and is connected to the liquid nitrogen cryogenic tank 1. Specifically, a liquid nitrogen inlet valve V10 is provided at one end of the heat conducting coil 10 close to the liquid guide tube 110, and a liquid nitrogen drain valve V11 is provided at one end of the heat conducting coil 10 close to the liquid nitrogen cryogenic tank 1. The liquid nitrogen in the liquid nitrogen storage device 3 flows through the liquid nitrogen inlet valve V9 and the liquid nitrogen inlet valve V10 and is introduced into the heat conducting coil 10, so that it is fully heat-exchanged with the outer surface of the valve pipe 103 and then discharged into the liquid nitrogen cryogenic tank 1 through the liquid nitrogen drain valve V11, and the valve pipe 103 is cooled by the low temperature characteristics of the liquid nitrogen.

[0058] By directly introducing liquid nitrogen into the contact point of the valve pipe 103, the heat conduction effect is enhanced, thereby more effectively reducing the temperature of the valve 100 to be tested, so as to meet the strict requirements of the valve test in the liquid hydrogen temperature zone. To ensure the heat exchange effect, the heat conducting coil 10 can be made of metal with good thermal conductivity, including but not limited to silver, copper, gold, aluminum and other materials.

[0059] Furthermore, the system further includes a first connecting pipeline 11 and a second connecting pipeline 7. One end of the first connecting pipeline 11 is connected to one end of the outlet branch 6 close to the liquid helium cooling chamber 2, and the other end is connected to the liquid guide tube 110, and a stop valve V12 is provided on the first connecting pipeline 11. One end of the second connecting pipeline 7 is connected to one end of the inlet branch 5 close to the liquid helium cooling chamber 2, and the other end is connected to the liquid nitrogen cryogenic tank 1, and a stop valve V13 is provided on the second connecting pipeline 7.

[0060] Close other valves, open only the valve 100 to be tested, then open the liquid nitrogen inlet valve V9, and add liquid nitrogen into the liquid nitrogen cryogenic tank 1 to soak the entire valve to be tested. Then open the stop valve V13, slowly open the stop valve V12, and the liquid nitrogen in the liquid nitrogen storage device 3 flows into the valve 100 to be tested, and then flows into the liquid nitrogen cryogenic tank 1. The liquid nitrogen directly flows into the valve 100 to be tested to cool the valve 100 to be tested, and quickly lowers the temperature of the valve 100 to be tested to -180°C, which improves the cooling efficiency and shortens the cooling time of the valve 100 to be tested before the test.

[0061] The temperature of each part is monitored by the temperature sensor. The liquid nitrogen inlet valve V10 and the liquid nitrogen discharge valve V11 are opened according to the temperature change to introduce liquid nitrogen into the heat transfer coil 10. When the temperature of the valve 100 to be tested reaches -180°C, the stop valve V12 and the stop valve V13 are closed.

[0062] Open the purge valve V3, adjust the helium pressure regulating valve V1 to adjust the outlet pressure of the gas cylinder to 1MPa, open the upstream isolation valve V2, and introduce helium into the entire test pipeline to purge the liquid nitrogen accumulated in the pipe. The helium is discharged from the C2 port. After the purge is completed, close the purge valve V3. Introduce helium to purge and gasify all the liquid nitrogen in the entire pipeline. After the purge, fill with liquid helium and continue to cool to -253℃ for testing. If the pipeline temperature drops to -253℃ without gasification and purging, which is lower than the solidification temperature of liquid nitrogen -210℃, the liquid nitrogen will solidify and block the pipeline, and subsequent tests cannot be carried out.

[0063] Open the liquid helium regulating valve V7 and the helium regulating valve V8, introduce liquid helium into the liquid helium cooling chamber 2, and use the temperature sensor to monitor the temperature of each part of the valve 100 to be tested. When the temperature of the valve 100 to be tested reaches -253°C and stabilizes, switch the valve 100 to be tested to a closed state.

[0064] Open the downstream isolation valve V4, close the valve to be tested 100, adjust the helium pressure regulating valve V1 according to the test requirements to introduce helium of the required pressure value into the test pipeline, and test the various performances of the liquid hydrogen valve at -253℃.

[0065] The control device is electrically connected or communicated with each valve, each temperature sensor, each pressure sensor, flow meter 64, alcohol bubble meter 62, etc., to control the adjustment action and switch switching of the pneumatic valve, so as to realize automatic control, and at the same time obtain the temperature, pressure, flow and other measurement parameters of each key part during the monitoring test. The measurement parameters include the ambient temperature, the liquid helium temperature in the liquid helium cooling chamber 2, the temperature of the valve 100 to be tested, the packing temperature, the outlet pressure of the first helium cylinder, the outlet pressure of the second helium cylinder, the pressure before the valve, the pressure after the valve, the outlet pressure of the liquid helium tank 42, the instantaneous leakage, the cumulative leakage, the average leakage, etc.

[0066] The embodiment of the present application also provides a method for testing the reliability of a liquid hydrogen temperature zone valve with reduced consumption and increased efficiency, using the above-mentioned liquid hydrogen temperature zone valve reliability testing system with reduced consumption and increased efficiency, including the following steps: The valve to be tested 100 is installed in the liquid helium cooling chamber 2 , the air inlet 101 of the valve to be tested 100 is connected to the air inlet pipe 51 , and the air outlet 102 of the valve to be tested 100 is connected to the air outlet pipe 61 .

[0067] Open the liquid nitrogen inlet valve V9, and introduce liquid nitrogen into the liquid nitrogen cryogenic tank 1. At this time, the liquid helium cooling chamber 2 is in a double-layer structure and is always in a vacuum state. Open the stop valve V12 and the stop valve V13, and introduce liquid nitrogen into the valve 100 to be tested. Open the liquid nitrogen inlet valve V10 and the liquid nitrogen drain valve V11, and introduce the liquid nitrogen into the heat transfer coil 10 to cool the valve 100 to be tested. First, use liquid nitrogen, which is more widely available and cheaper, as a cooling medium to cool the valve 100 to -150°C, or even lower, and the lowest temperature can be -196°C. This temperature is related to the cooling time.

[0068] When the second temperature sensor TC2 detects that the temperature of the valve 100 to be tested reaches the first preset temperature, which can be set between -150°C and -196°C, the stop valve V12 and the stop valve V13 are closed. Liquid helium is introduced into the liquid helium cooling chamber 2, and liquid helium is used as a cooling medium to continue cooling, so that the valve 100 to be tested is further cooled; when the second temperature sensor TC2 detects that the temperature of the valve 100 to be tested reaches the second preset temperature, the second preset temperature is less than the first preset temperature, and the second preset temperature is set to -253°C. The test main circuit is turned on, the valve 100 to be tested is closed, helium is introduced into the valve 100 to be tested through the air inlet branch 5, and the sealing condition of the valve 100 to be tested is determined through the air outlet branch 6.

[0069] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0070] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A liquid hydrogen temperature zone valve reliability test system for reducing consumption and increasing efficiency, characterized in that: include: A cryogenic container comprising a liquid nitrogen cryogenic tank (1) and a liquid helium cooling chamber (2); The liquid nitrogen cryogenic tank (1) is selectively connected to the liquid nitrogen storage device (3) via a liquid guide tube (110); the liquid helium cooling chamber (2) comprises a closed chamber, which is located in the liquid nitrogen cryogenic tank (1) and selectively connected to the liquid helium storage device (4) via a liquid inlet tube (210), and is used to accommodate a valve body of a valve to be tested (100); the valve to be tested (100) is provided with an air inlet (101), an air outlet (102) and a valve connecting pipe (103); The test main circuit comprises an air inlet branch (5) and an air outlet branch (6); the air inlet branch (5) is used to communicate with the air inlet (101) of the valve to be tested (100) to introduce helium into the valve to be tested (100); the air outlet branch (6) is used to communicate with the air outlet (102) of the valve to be tested (100) to determine the sealing condition of the valve to be tested (100); The heat conducting coil (10) is located in the liquid helium cooling chamber (2) and is used to be wound around the valve pipe (103). One end of the heat conducting coil passes through the liquid helium cooling chamber (2) and is selectively connected to the liquid conducting pipe (110), and the other end passes through the liquid helium cooling chamber (2) and is connected to the liquid nitrogen cryogenic tank (1).

2. The liquid hydrogen temperature zone valve reliability testing system for reducing consumption and increasing efficiency according to claim 1 is characterized in that: Also includes: a first connecting pipe (11), one end of which is in communication with an end of the gas outlet branch (6) close to the liquid helium cooling chamber (2), and the other end of which is in communication with the liquid guide pipe (110); a stop valve is provided on the first connecting pipe (11); A second connecting pipe (7) has one end in communication with one end of the air inlet branch (5) close to the liquid helium cooling chamber (2), and the other end in communication with the liquid nitrogen cryogenic tank (1); a stop valve is provided on the second connecting pipe (7).

3. The liquid hydrogen temperature zone valve reliability testing system for reducing consumption and increasing efficiency according to claim 1 or 2 is characterized in that: The gas outlet branch (6) comprises a gas outlet pipe (61), an alcohol bubble counter (62) and an exhaust pipe (63); one end of the gas outlet pipe (61) extends into the bottom of the alcohol bubble counter (62), and the other end passes through the liquid helium cooling chamber (2) and is used to communicate with the gas outlet (102) of the valve to be tested (100); one end of the exhaust pipe (63) extends into the top of the alcohol bubble counter (62), and the other end is used for exhausting gas.

4. The liquid hydrogen temperature zone valve reliability testing system for reducing consumption and increasing efficiency according to claim 3 is characterized in that: The exhaust pipe (63) is provided with a flow meter (64).

5. The liquid hydrogen temperature zone valve reliability testing system for reducing consumption and increasing efficiency according to claim 1 is characterized in that: The wall of the liquid helium cooling chamber (2) is a double-layer structure and is provided with an interface for communicating with a vacuum pumping device.

6. The liquid hydrogen temperature zone valve reliability testing system for reducing consumption and increasing efficiency according to any one of claims 1 or 5, characterized in that: The tank wall of the liquid nitrogen low-temperature tank (1) is a double-layer structure, and an insulating layer is provided between the inner and outer layers.

7. The liquid hydrogen temperature zone valve reliability testing system for reducing consumption and increasing efficiency according to claim 1 is characterized in that: It also includes a temperature measuring component, the temperature measuring component includes a second temperature sensor (TC2), the second temperature sensor (TC2) is used to be arranged on the valve to be tested (100) to measure the temperature of the valve to be tested (100); and / or The air intake branch (5) comprises a first helium storage device (52) and a booster pump (53) which are connected in sequence through an air intake pipe (51); an end of the air intake branch (5) away from the first helium storage device (52) passes through the liquid helium cooling chamber (2) and is used to communicate with the air intake port (101) of the valve to be tested (100).

8. The liquid hydrogen temperature zone valve reliability testing system for reducing consumption and increasing efficiency according to claim 1 is characterized in that: The liquid helium storage device (4) comprises a second helium storage device (41) and a liquid helium tank (42); the second helium storage device (41) is in communication with the top of the liquid helium tank (42); one end of the liquid inlet pipe (210) extends into the bottom of the liquid helium tank (42), and the other end is in communication with the top of the liquid helium cooling chamber (2).

9. The liquid hydrogen temperature zone valve reliability testing system for reducing consumption and increasing efficiency according to claim 1 is characterized in that: It also comprises a first discharge pipe (8), the gas outlet branch (6) is in communication with the first discharge pipe (8), and a purge valve (V3) is provided on the first discharge pipe (8); and / or It also comprises a second discharge pipe (9), wherein the second discharge pipe (9) is connected to the top of the liquid helium cooling chamber (2), and the second discharge pipe (9) is connected to a discharge valve (V5) and / or a safety valve (V6).

10. A liquid hydrogen temperature zone valve reliability testing method for reducing consumption and increasing efficiency, characterized in that: The liquid hydrogen temperature zone valve reliability testing system for reducing consumption and increasing efficiency based on any one of claims 1 to 9 comprises the following steps: Installing the valve to be tested (100) in the liquid helium cooling chamber (2) and connecting it to the test main circuit; Introducing liquid nitrogen into the liquid nitrogen low temperature tank (1) and the heat conducting coil (10) to cool the valve to be tested (100); Introducing liquid helium into the liquid helium cooling chamber (2) to further cool the valve to be tested (100); After cooling, the test main circuit is opened, the valve to be tested (100) is closed, helium is introduced into the valve to be tested (100) through the air inlet branch (5), and the sealing condition of the valve to be tested (100) is determined through the air outlet branch (6).

Images